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ur toshiba hdd is ur laptop's primary hard disk, so it is not booting from external hard disk, so open bios in ur laptop and set booting with usb as primary booting device, it works, if u have more doubts post me again

OK just go to say, Ebay, or your local PC store, and buy a HDD/DVD, SATA/IDE - USB "Dongle" Pack, they are real inexpensive, simply use the interface that matches your HDD the "Dongle" has BOTH connectors, hook up the Power to the HDD/DVD and hook up to the PC via USB, to the PC, the PC, should "See" the device, and install a "Driver' then it should be available in My Computer, as a normal "Drive".
Example below.

Toshiba highly recommends the customer to fully understand what HDD Password is and once registered please keep your "PASSWORD" in a safe place.Your HDD password is different from your BIOS Password. Your BIOS Password is stored in the computer, but your HDD Password is stored in the HDD unit itself. So even the HDD unit is removed from one computer and attached to another, the HDD password is required to access it.If you forget your HDD User Password, TOSHIBA will NOT be able to assist you, and your HDD will be rendered COMPLETELY and PERMANENTLY INOPERABLE. TOSHIBA will NOT be held responsible for any loss of data, any loss of use or access to your HDD, or for any other losses to you or any other person or organization resulting from the loss of access to your HDD. http://aps2.toshiba-tro.de/kb0/TSB6B01MC000CR01.htm

I don't think there is a converter from USB to ESATA, but you could buy a new Hard Drive enclosure that has those options, but I am not sure if you are willing to take out the HD from the existing one.